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bdf9209824
Previously, the `DummyConnectionHandler` offered a "keep alive" functionality, i.e. it allowed users to set the value of what is returned from `ConnectionHandler::keep_alive`. This handler is primarily used in tests or `NetworkBehaviour`s that don't open any connections (like mDNS). In all of these cases, it is statically known whether we want to keep connections alive. As such, this functionality is better represented by a static `KeepAliveConnectionHandler` that always returns `KeepAlive::Yes` and a `DummyConnectionHandler` that always returns `KeepAlive::No`. To follow the naming conventions described in https://github.com/libp2p/rust-libp2p/issues/2217, we introduce a top-level `keep_alive` and `dummy` behaviour in `libp2p-swarm` that contains both the `NetworkBehaviour` and `ConnectionHandler` implementation for either case.